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Theme Dataset/Hotlink Source/Location
Census (TIGER Line Shapefiles) Processed 2010 TIGER GIS data

2017
Census Block Groups
Census Blocks
Census Tracts
Congressional Districts
School Districts
Legislative Districts
Zip Codes

CO Dept of Local Affairs
Census
Census
Census
Census
Census
Census
Census
Counties Counties (from Department of Transportation)
Counties (from Dept of Local Affairs)
CDOT
DOLA
Environmental/
Conservation
COMaP: Colorado Ownership, Management, and Protection
BLM CO National Conservation Areas
BLM CO Wilderness Areas
BLM CO Wilderness Study Areas
Mountain Summits
CSU
BLM
BLM
BLM
BLM
CGS
Districts

(See Colorado View also)

Fire
Hospitals
Metropolitan
Park & Recreation
School Districts
Water & Sanitation
DOLA
DOLA
DOLA
DOLA
DOLA
DOLA
DOLA
Geology CO Geological Map Data
Geological mapping
Oil & Gas Facilities
Oil & Gas Locations
Well locations (maps -> GIS downloads)
USGS
CGS
COGCC
COGCC
COGCC
Hydrography CO Decision Support System 
NHD by State  (use Internet Explorer for ftp)
Hydrography (24K and 100K lines/bodies)
Lakes
NHD+, Region 14
Streams
Waterfalls
CDSS
USGS
NDIS/CDOW
CDOT
Horizon Systems, NHD+
CDOT
CGS
Imagery NAIP (federal site)
NAIP via ArcGIS Server (NOT a link; a map service) ColoradoView (Landsat, MODIS, Aerial Imagery)
NRCS/USDA
USDA Farm Service Agency
Indexes GCDB Land Grid Description
GCDB Land Grid Nodes
GCDB Land Grid Polygons
GCDB Land Grid Sections
GCDB Land Grid Townships
BLM
BLM
BLM
BLM
BLM
Land Use NLCD, zones 22, 23, 27, 28, 33
(Multi-zone Download Site)
MRLC
Ownership COMaP
Statewide Land Ownership
CSU
BLM
Places (cities/towns) Cities (see also Colorado View) 
Places
Place names
CDOT
Census
USGS/Board on Geographic Names
Reference ESRI datasets available to CSU license holders. DVDs available for check-out from RamTech ESRI/RamTech at CSU
Transportation (CDOT Data Catalog Search Engine; See Colorado View also) Airports

Highways
Local roads
Major roads
Railroads

CDOT
CDOT
CDOT
CDOT
CDOT
Vegetation Colorado Vegetation Classification Project by basin
Noxious weeds
Riparian mapping by 1:100K block
Vegetation (GAP Land Cover)
NDIS/CDOW

CDOT
NDIS/CDOW
NDIS/CDOW

Wildlife Species activity (41 species, layer package)

Species Data (USGS GAP data)

Species Activity (by species, shapefiles)
Wild Horse & Burro Herd Areas

NDIS/CDOW
BLM
World Reference World Base Maps (ESRI ArcGIS Service)

Good list of global GIS datasets

Stanford University: Free GIS Datasets

ESRI map service
State and National Shapefiles Colorado View Data